US14218A - Machinery for cutting- sandpaper - Google Patents

Description

WILLIAM ADAMSON, OF PHILADELPHIA, PENNSYLVANIA.

MACHINERY FOR CUTTING- SANDPAPER.

Specification of Letters Patent No. 14,218, dated February 12, 1856.

T0 all whom t may concer/n.'

Be it known that I, VILLIAM ADAMsoN, of the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in the Construction of Cutters and Slitters for Sandpaper-Machines; and I do hereby declare that the following is a full, clear, and eXact description of the same, reference being had to the annexed drawings, making a part of this speciticat-ion, in which- Figure 1 represents a vertical longitudinal section of my improved cutt-ing and slitting machine. Fig. 2 represents a detached view of my slitting cutters shown in transverse section. Fig. 3 represents a front view of my improved rotating cutters showing the revolving cutter detached. Fig. 4 represents a vertical section of my revolving cutter taken longitudinally showing the manner in which the knives are attached.

Heretofore in the manufacture of said paper it has been customary to make the sand paper in long sheets and to slit the same into the required width and to cut it into the required lengths by means of large shears or sliding knives. It had been found that revolving slitters or cutters when used for slitting or cutting sandpaper became rounded or beveled at the edges in consequence of the gritty material in the paper, and soon ceased to cut at all.

My improvement consists in an arrangement of a pair of drums made of thin metal the edges of which rotate at one point of their circumference in contact and slitthe paper into the required width as it passes.

To enable others skilled in the art to make and use my improved slitter and cutter I proceed to describe its construction and operation.

Fig. 1 represents a longitudinal vertical section of my improved cutter and slitter.

C, represents a roll of sand paper.

A and B, represent the slitting drums. They are both alike and are composed of a thin steel blade bent around into the form of a drum and secured on the hubs G and G as shown at A and B Fig. 2. Each slitter is about four inches in diameter, about four inches broad, and about one-sixteenth of an inch thick. The slitter A is attached by the hub g g to the shaft IV WV and the slitter B is attached by the hub g g to the shaft y y. The shaft W W and the shaft Y Y are so arranged that the edge of the upper part of the circumference of B shall just come in contact with the edge of the lower part of the circumference of A at a single point. The shafts W W and Y Y are supported at each extremity in bearings on the upright frame. The slitter B is secured in its place on the shaft y y by the set screw 5, and the slitter A is kept up against the edge of B by the spiral spring S which presses against the fixed collar F F the spring S thus forcing the lower edge of A. against the upper edge of B and preserving a contact between the cutting surfaces. The operation of this part of my improvement is as follows. As the paper unrolls from C in Fig. 1 it passes between A and B as shown at P I. These cutters A and B are placed so that the cutting edge shall be in the middle of the width of the passing paper P P.

The paper passes between two drawing rollers D and E which drag it along between the slitters A and B. These slitters slit the paper as it passes between them, the effect being similar to the action of a pair of shears. The grit in the paper wears the edges away and would tend to make them uneven, but these edges by grinding constantly against each other are kept always smooth and square. As fast as these edges wear away, the spring S s forces the edge of the slitter A up against B and preserves the cutting action until the whole of the drum is worn down, which I have found will not take place until the machine has slit 2500 reams of paper. It will be seen that these slitters grind themselves and preserve a square edge and, therefore, do not need any sharpening or repair. These slitting drums are moved by ordinary cog or belt gearing.

My improvement is applicable to machinery for cutting emery paper, emery cloth, enameled cards, bristol boards, and any similar material of a gritty nature as well as wet or damp paper.

Having thus described my improvements what I claim and desire to secure by Letters Patent is- The arrangement and combination of the slitting drums A and B in the manner and for the purpose substantially as is herein set forth.

WM. ADAMSON.

Witnesses:

J. E. SHAW, CHARLES D. FREEMAN.

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